Plotting received image at QGraphicsView

[thomas11live.com.sg]

Dear All,
I am trying to plot the image received from a camera.
The camera image is in Opencv format and converted to Qimage format and I display in QGraphicsView. But I don't know why the image is not displayed at the window.

@MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{

ui->setupUi(this);

cameraisConnected = false;
imageCaptureThreadStarted = false;
//UI implementation

//View initialization
ui_Implementation(ui);
scene = new QGraphicsScene(view);
scene2 = new QGraphicsScene(view2);
pixmaItem = new QGraphicsPixmapItem();
pixmaItem2 = new QGraphicsPixmapItem();

scene->addItem(pixmaItem);
view->setScene(scene);
scene->setSceneRect(0,0,300,200);
view->setRenderHints(QPainter::Antialiasing);
imageshown = false;

// plot();
}@

@void MainWindow::newImageReceivedInformed(imageData receiveImage)
{
opencvimageData_t opcvImage;
QPixmap pixma;
int col = receiveImage.imageframe.GetCols();// captured image's column
int row = receiveImage.imageframe.GetRows();// captured image's row
int data_size = receiveImage.imageframe.GetDataSize();//captured image's data size
QImage qImg = QImage(col, row, QImage::Format_RGB32);
opcvImage.opencvimageframe = cvCreateImage(cvSize(col, row), IPL_DEPTH_8U, 1);//3 channels for RGB
memcpy(opcvImage.opencvimageframe->imageData, receiveImage.imageframe.GetData(), data_size);
opcvImage.imgnumber = receiveImage.snr;
capturedImageQueue.setQueue(opcvImage);
IplImage2QImage(opcvImage.opencvimageframe, qImg);
pixma = QPixmap::fromImage(qImg);
pixmaItem->setPixmap(pixma);
view->show();
}@

@void MainWindow::IplImage2QImage(IplImage *iplImg, QImage &qimg)
{
int h = iplImg->height;
int w = iplImg->width;
int channels = iplImg->nChannels;
char *data = iplImg->imageData;
for (int y = 0; y < h; y++, data += iplImg->widthStep)
{
for (int x = 0; x < w; x++)
{
char r, g, b, a = 0;
if (channels == 1)
{
r = data[x * channels];
g = data[x * channels];
b = data[x * channels];
}
else if (channels == 3 || channels == 4)
{
r = data[x * channels + 2];
g = data[x * channels + 1];
b = data[x * channels];
}

   if (channels == 4)
   {
      a = data[x * channels + 3];
      qimg.setPixel(x, y, qRgba(r, g, b, a));
   }
   else
   {
       qimg.setPixel(x, y, qRgb(r, g, b));
   }
  }

}
return;

}@